OpenAI: The End of GPT-4o and Older Models Era

On January 29, 2026, OpenAI officially announced the retirement of several legacy models, including GPT-4o and GPT-4.1. The shutdown is scheduled for February. This move is part of a strategy to unify infrastructure and migrate users to more efficient and secure architectures (o3/GPT-5 series).

For developers and enterprise clients, this is a signal for urgent migration. Supporting legacy models is becoming a burden that slows down the deployment of new agents and security features. OpenAI is moving towards an aggressive product line refresh.

Source: OpenAI Blog